<div style="height: 100%; display: flex; flex-direction: column; gap: 0.5rem">
    <div style="flex: none; display: flex; gap: 8px; align-items: center">
        spacing = <span style="min-width: 50px"><span id="spacing">8.0</span>px</span>
        <input
            type="range"
            oninput="changeSize(event.target.valueAsNumber)"
            value="8"
            min="0"
            max="20"
            step="0.1"
            style="width: 200px"
        />
    </div>
    <div id="myGrid" style="flex: 1 1 auto"></div>
</div>
